Help - List.Generate dates with variable frequency in months

[ben-t]

Hi, I'm trying to generate a list of jobs to do in the next 2 years
I have a working custom column that provides me the list of dates. 
But my jobs have varying frequencies of 2-12 months intervals. 

List.Generate(() => [Next job],
each Date.From(_) <= Date.From(Date.AddYears(Date.EndOfYear(DateTime.LocalNow()), 1)),
each Date.AddMonths(_, 2))

Once I change my code to :

List.Generate(() => [Next job],
each Date.From(_) <= Date.From(Date.AddYears(Date.EndOfYear(DateTime.LocalNow()), 1)),
each Date.AddMonths( _ , [FREQUENCY]))

I get an error and when expanding further, it just shows me a date without any error message. 

Anyone knows what is causing this issue, and how I can work around it ?

Thanks

[HotChilli · Accepted solution]

It might be a field access error.

Try

let freq = [FREQUENCY] in each Date.AddMonths( _ , freq))

[ben-t]

It generates without issue once i added in this line
Thanks! 

[GekkeHellie]

Hi ben-t,

Could you share the full code that worked for you?

I think I've tried every possible code with the above solution, but I still get an error.

Thanks!

[ben-t]

Hi @GekkeHellie

this is the code i used

let freq = [FREQUENCY] in
List.Generate(
() => [Next job],
each Date.From(_) <= Date.From(Date.AddYears(Date.EndOfYear(DateTime.LocalNow()),1)),
each Date.AddMonths(_, freq))

[GekkeHellie]

Hi @ben-t ,

Your answer definitely helped me into the right direction.

In the table there is a start date, end date and frequency and I also wanted to create a new row between the two dates based on de frequency.

My table looks like this:

But since I have a end date in a column, instead of a formula like yours, I still got a error.

So I also added the below line to the code:

let enddate = [End Date]

let freq = [Frequency] in
let enddate = [End Date] in
List.Generate(
() => [Start Date],
each Date.From(_) <= Date.From(enddate),
each Date.AddDays(_, freq))

Thanks for helping me out!

[m_dekorte]

Hi @ben-t 

Its an invironment/ item access issue, here's a work around. Just assign the field value to a variable and bring that into your calculation.

let n = [FREQUENCY] in List.Generate(() => [Next job],
each Date.From(_) <= Date.From(Date.AddYears(Date.EndOfYear(DateTime.LocalNow()), 1)),
each Date.AddMonths(_, n ))

Ps. If this helps solve your query please mark this post as Solution, thanks!